Apogee Instruments S2-442 Manual do Proprietário - Página 8
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Cosine Response
Directional, or cosine, response is defined as the
measurement error at a specific angle of radiation
incidence. Error for Apogee S2 series PAR-FAR sensors
is approximately ± 2 % and ± 5 % at solar zenith angles
of 45° and 75°, respectively.
Mean directional (cosine) response
of seven apogee PAR-FAR sensors.
Directional response measurements
were made on the rooftop of the
Apogee building in Logan, Utah.
Directional response was calculated
as the relative difference of PAR-FAR
sensors from the mean of replicate
PAR detectors (LI-COR models LI-190
and LI-190R, Kipp & Zonen model
PQS 1). Data were also collected in
the laboratory using a reference
lamp and positioning the sensor at
varying angles.